Antarctic krill (Euphausia superba) biomass density estimates derived from acoustic backscatter data collected in the Western Core Box survey, South Georgia, South Atlantic: 1996 - 2019

This dataset contains processed acoustic backscatter data that reflect integrated density estimates for Antarctic krill (Euphausia superba). The acoustic backscatter data are from the Western Core Box (WCB), comprising 8 acoustic transects that span the shelf-break at South Georgia. The data were obtained from a time series of 22 cruises carried out between 1996/97 and 2019/20. Data were collected using either a Simrad EK500 or EK60 echo sounder by biological oceanographers working at the British Antarctic Survey under the Ecosystems scientific research programme and predecessor Discovery 2010 and Dynamo research programmes.





Funding was provided by the NERC/BAS Antarctic, Logistic, Infrastructure (ALI) Science and predecessor Long Term Monitoring Science research programmes.

Simple

Date (Creation)
2022-09-27
Date (Revision)
2022-09-27
Date (Publication)
2022-09-27
Date (released)
2022-09-27
Edition

1.0
Unique resource identifier
https://doi.org/10.5285/e85a9312-8531-4261-a2f6-1c58f40cfc71
Codespace

doi
Unique resource identifier
GB/NERC/BAS/PDC/01671
Codespace

https://data.bas.ac.uk/

Other citation details

Please cite this item as: Fielding, S., Enderlein, P., Stowasser, G., Tarling, G., & Manno, C. (2022). Antarctic krill (Euphausia superba) biomass density estimates derived from acoustic backscatter data collected in the Western Core Box survey, South Georgia, South Atlantic: 1996 - 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e85a9312-8531-4261-a2f6-1c58f40cfc71

Credit

No credit.
Status
Completed
Point of contact
Organisation name Individual name Electronic mail address Role
British Antarctic Survey Fielding, Sophie Author
British Antarctic Survey

Enderlein, Peter

 		Author
British Antarctic Survey Stowasser, Gabriele Author
British Antarctic Survey Tarling, Geraint A. Author
British Antarctic Survey Manno, Clara Author
NERC EDS UK Polar Data Centre

PDCServiceDesk@bas.ac.uk

Point of contact
Maintenance and update frequency
As needed
Maintenance note
Completed
Global Change Master Directory (GCMD) Science Keywords
Theme

  • Acoustic backscatter

  • Antarctic krill

  • EK500

  • EK60

  • Euphausia superba

  • Scotia Sea

  • South Georgia

  • WCB

  • Western Core Box
Place

  • Scotia Sea Southern Ocean

  • South Georgia Southern Ocean

GEMET - INSPIRE themes, version 1.0
Access constraints
Other restrictions
Other constraints
no limitations to public access
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Other restrictions
Other constraints
no limitations
Use constraints
License
Other constraints
Open Government Licence v3.0
Use constraints
Other restrictions
Other constraints

Data are released under Open Government Licence V3.0:
Use constraints
Other restrictions
Other constraints

No restrictions apply.
Unique resource identifier
url
Codespace

url
Association Type
Cross reference
Unique resource identifier
doi
Codespace

doi
Association Type
Cross reference
Unique resource identifier
doi
Codespace

doi
Association Type
Cross reference
Unique resource identifier
doi
Codespace

doi
Association Type
Cross reference
Unique resource identifier
doi
Codespace

doi
Association Type
Cross reference
Unique resource identifier
url
Codespace

url
Association Type
Cross reference
Unique resource identifier
url
Codespace

url
Association Type
Cross reference
Unique resource identifier
url
Codespace

url
Association Type
Cross reference
Spatial representation type
Text, table
Language
English
Character set
UTF8
Topic category
  • Biota
  • Environment
  • Oceans
N
S
E
W
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Begin date
1996-12-29
End date
2019-12-07
Supplemental Information

It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
Date (Publication)
2008-11-12
Cited responsible party
Organisation name Individual name Electronic mail address Role

European Petroleum Survey Group

EPSGadministrator@iogp.org

Publisher
Unique resource identifier
urn:ogc:def:crs:EPSG::3031
Version

6.18.3

Distributor

Distributor contact
Organisation name Individual name Electronic mail address Role
NERC EDS UK Polar Data Centre

PDCServiceDesk@bas.ac.uk

Distributor
Distributor format
Name Version
text/plain
text/csv
Units of distribution

bytes
Transfer size
2010112
OnLine resource
Protocol Linkage Name

WWW:LINK-1.0-http--link

 		https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e85a9312-8531-4261-a2f6-1c58f40cfc71

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bytes
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2010112
OnLine resource
Protocol Linkage Name

WWW:LINK-1.0-http--link

 		https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e85a9312-8531-4261-a2f6-1c58f40cfc71

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Hierarchy level
Dataset
Statement

Methodology:

Acoustic surveys targeting Antarctic krill (Euphausia superba) within the Western Core Box (WCB; an area covering 132 km by 80 km) to the northwest of South Georgia have been described previously (Trathan et al., 2003; Reid et al., 2010; Fielding et al., 2014). Here we extend the time series from 1997 to 2020, using only acoustic surveys that took place within a fixed time window (1 December to 16 February), given that known intra-annual variation in the timing of peak summer biomass can affect estimates of krill mean density at South Georgia (Saunders et al., 2007; Reid et al., 2010). The WCB includes on-shelf and off-shelf areas sometimes used by predators foraging from Bird Island.



During each survey, acoustic data were collected along eight transects, although in some years not all transects could be completed. Also, the location of some transects changed after the first few years. Acoustic data were depth integrated to 250 m (or to 2 m above the sea floor if shallower) with a horizontal average integration distance of 500 m.



Estimate of krill density in each acoustic sampling interval were derived using the 3 frequency (38, 120 and 200 kHz) identification model and the ASAM TS model (Fielding et al., 2011; 2014; 2016).

Metadata

File identifier
e85a9312-8531-4261-a2f6-1c58f40cfc71 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name

dataset
Date stamp
2022-09-27
Metadata standard name

ISO 19115 Geographic Information - Metadata
Metadata standard version

ISO 19115:2003(E)
Metadata author
Organisation name Individual name Electronic mail address Role
NERC EDS UK Polar Data Centre

polardatacentre@bas.ac.uk

Point of contact
 
 

Overviews

Spatial extent

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Keywords

Acoustic backscatter Antarctic krill EK500 EK60 Euphausia superba Scotia Sea South Georgia WCB Western Core Box
GEMET - INSPIRE themes, version 1.0

Oceanographic geographical features
Global Change Master Directory (GCMD) Science Keywords

EARTH SCIENCE > Oceans > Marine Environment Monitoring EARTH SCIENCE > Oceans > Ocean Acoustics > Acoustic Scattering


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